Jump to content

smithd

Members
  • Content Count

    758
  • Joined

  • Last visited

  • Days Won

    42

Everything posted by smithd

  1. just curious if anyone has ever made an attempt to improve scripting out of dlls. I know theres the built in import wizard, but I've literally never seen that work (has anyone here?). The reason i'm asking is that I was thinking about it and came across this tool: https://github.com/CastXML/CastXML (binaries from the build link at the bottom here: https://github.com/CastXML/CastXMLSuperbuild) Essentially it takes a C header (or any C file I guess) and processes it with LLVM to produce an XML tree of all the functions and types. For example it takes the header here: https://github.com/nanomsg/nng/blob/master/include/nng/nng.h and produces xml which includes stuff like this: <Typedef id="_8" name="ptrdiff_t" type="_285" context="_1" location="f1:51" file="f1" line="51"/> <Typedef id="_9" name="wchar_t" type="_286" context="_1" location="f1:90" file="f1" line="90"/> <Typedef id="_14" name="intptr_t" type="_285" context="_1" location="f4:182" file="f4" line="182"/> <Union id="_78" name="nng_sockaddr" context="_1" location="f6:151" file="f6" line="151" members="_328 _329 _330 _331 _332 _333" size="1088" align="64"/> <Struct id="_61" name="nng_aio" context="_1" location="f6:96" file="f6" line="96" incomplete="1"/> <Struct id="_68" name="nng_sockaddr_in6" context="_1" location="f6:124" file="f6" line="124" members="_315 _316 _317" size="160" align="16"/> <Field id="_315" name="sa_family" type="_25" context="_68" access="public" location="f6:125" file="f6" line="125" offset="0"/> <Field id="_316" name="sa_port" type="_25" context="_68" access="public" location="f6:126" file="f6" line="126" offset="16"/> <Field id="_317" name="sa_addr" type="_385" context="_68" access="public" location="f6:127" file="f6" line="127" offset="32"/> <Typedef id="_79" name="nng_sockaddr" type="_334" context="_1" location="f6:158" file="f6" line="158"/> <Enumeration id="_80" name="nng_sockaddr_family" context="_1" location="f6:160" file="f6" line="160" size="32" align="32"> <EnumValue name="NNG_AF_UNSPEC" init="0"/> <EnumValue name="NNG_AF_INPROC" init="1"/> <EnumValue name="NNG_AF_IPC" init="2"/> <EnumValue name="NNG_AF_INET" init="3"/> <EnumValue name="NNG_AF_INET6" init="4"/> <EnumValue name="NNG_AF_ZT" init="5"/> </Enumeration> <Function id="_84" name="nng_close" returns="_293" context="_1" location="f6:194" file="f6" line="194" mangled="?nng_close@@9" attributes="dllimport"> <Argument type="_55" location="f6:194" file="f6" line="194"/> </Function> <Function id="_87" name="nng_setopt" returns="_293" context="_1" location="f6:205" file="f6" line="205" mangled="?nng_setopt@@9" attributes="dllimport"> <Argument type="_55" location="f6:205" file="f6" line="205"/> <Argument type="_338" location="f6:205" file="f6" line="205"/> <Argument type="_339" location="f6:205" file="f6" line="205"/> <Argument type="_5" location="f6:205" file="f6" line="205"/> </Function> <FundamentalType id="_293" name="int" size="32" align="32"/> <FundamentalType id="_294" name="unsigned char" size="8" align="8"/> <FundamentalType id="_295" name="unsigned int" size="32" align="32"/> <PointerType id="_353" type="_352" size="64" align="64"/> <PointerType id="_354" type="_62" size="64" align="64"/> <PointerType id="_355" type="_47" size="64" align="64"/> Its pretty easy to parse because everything has an ID -- I've got some truly gross code for converting all the struct and enum definitions into labview which is simple enough. I guess I'm just testing the waters to see if anyone else thinks this is useful. My usual strategy right now is to minimize the number of C calls I make, but if I could just magically import a header and get the library made for me, it would be pretty cool. But on the other hand, theres so many challenges associated with that which I hadn't thought about going in, like handling structs by value, or what to do with numeric return values (is it an error code? is 0 good or bad?). The particular library I selected as a test case above has two features that are super annoying -- its main 'session' reference is not a pointer like in most C apis, but a struct containing a single int, and it also has a union type..for some reason. So even making this library work, which I thought would be an easy way to try it out, has ballooned in complexity a bit. Thoughts?
  2. Also, this is kind of a side point but the concept is the same. Has anyone noticed that reentrant VIs get super slow sometimes when debugging? Its not always, but I can't figure out what conditions might be causing it. Its like you're going along debugging some code, you step into a reentrant VI, and everything just stops, and it takes like 20-30 seconds for the window to materialize. I know its not just one computer, sadly.
  3. This may have already been mentioned, but have you tried changing the compiler complexity threshold? http://zone.ni.com/reference/en-XX/help/371361P-01/lvdialog/miscellaneous_options/#compiler Its possible its trying to compile while you drag or something, and maybe the drag selector interacts with the UI thread more or something.
  4. There should not be, adapting to type is all you want and thats what vims do. As pointed out, queues are not a runtime-dispatchable type in the same way you cannot dynamic dispatch off a boolean or an array. The contents are irrelevant. Its worth noting that vims support dispatching based on method name rather than class hierarchy. There are examples of using vims to make lvclasses act kind of like interfaces (ie if you have two separate hierarchies with a method "Get queue" which returns a thing at connector pane position 3, you can put that in a vim and it will adapt, including if that outputted thing has a different type). As a side note, you can and should wrap the queue status and index primitives inside of a disable structure.
  5. I'm curious how this would work in more detail if you could share. It sounds interesting, but it also sounds like...a lot. For example I'm not sure where kibana fits in, and I'm curious what mongo gets you that you couldn't get with a more common database like postgres. This kind of reminded me of what you are describing. It wasn't really applicable for me but it came to mind when I read your post. It looks like their "driver" can (in at least this case) just be an ini file. Since it sounds like you're open to python, this have always been on my "neat, but I don't have a use now" list: https://airflow.apache.org/ Its a task graph and you can use something like celery or zeromq or amqp to move data to those tasks. Also, on the topic of kibana+databases, this tool is way cool: https://github.com/apache/incubator-superset its basically a graphical sql editor in python/html which talks to any sql db python can talk to, and with a bunch of cool visualizations. I've not used it 'in production' but its similar to (and 1000x better) than something we had built in house and I demo'd it to some folks and they liked it almost as much as I did. I know its not related to this topic at all but I like it.
  6. mjpeg doesnt work like that, its literally a bunch of jpegs in a wrapper. Random access should work as well as forward access. I'd bet forward access has some caching and pre-fetching though, so for random access check your cpu load, memory, and disk usage while trying to play the video. I'd bet you're hitting some limit. Specifically you are asking a lot of windows to smoothly unpack a randomly accessed frame every 34 ms using software decoding.
  7. I think this important and descriptive org chart diagram is obligatory for any reference to oracle:
  8. Its definitely open source, you just can't use it or copy it...and I imagine flarn could sue you if you release something kind of like his code and its discovered that you knew about this code. In the US, I believe lava gets away with this because of safe harbor provisions in the otherwise frightening DMCA. Even without that, many forums have terms of use which generically cover these things. For example from ni.com: As I read that, it sounds like the site basically says ni can do anything it wants with anything you upload, including distribution and copying. Other parts of the terms of use also make it clear that just because NI has that right, doesn't mean the original uploaded conferred that right to any downloaders, only to NI. So in other words (again, as I interpret this), uploading code means other people can download it, but they still cant use or distribute it without a license from the original uploader.
  9. Yeah if you have only source, 2 GB is plenty even for labview. Not sure about build process issues, but for me I ran a little function post-build to upload the exe/etc to an internal server running an artifact repository. Given that you run lava, I'm guessing you could set something like that up and host it yourself, or maybe your workload is light enough you could use the free tier of amazon/ms/oracle/google's cloud services. As to specifics: I used artifactory, but a nice simple route would be to just set up a separate git server with lfs support and then your post build step is a push to a different repo. Or you could even set up your /build directory as a git submodule or subtree (i forget the diff, I think submodule is right for this) where the main repo points at github while the submodule points at your server. Gitlab I think has a free instance for self hosting, and gitea is a free github clone, and amazon has a hosted version thats free up to a limit as does google. Edit: or just use gitlab: https://about.gitlab.com/2015/04/08/gitlab-dot-com-storage-limit-raised-to-10gb-per-repo/
  10. Along the same lines as the raspberry pi, its pretty annoying that NI has gotten rid of these fine old beasts: http://sine.ni.com/psp/app/doc/p/id/psp-655/lang/en Theres obviously a ton of ethernet->serial boxes out there, but most of them seem to require local windows drivers to emulate them as local serial ports
  11. Not VISA, but it seems simple enough to use linx? https://www.labviewmakerhub.com/doku.php?id=learn:libraries:linx:reference:labview:uart-open
  12. Per the "Details" section of the help here http://zone.ni.com/reference/en-XX/help/370281AE-01/imaqvision/imaq_imagetoimage_2/ I think you just need to reuse the mask you created earlier. If the ROI is a polygon, the mask will be a polygon so when you use imagetoimage it will only copy the pixels inside of the polygon.
  13. It forces the OS to finish any pending writes. Closing the file does the same thing. So if the concern causing you to continuously open and close the file was to ensure that your data was safely on disk rather than pending, flush would give the same result. It sounds like that was not your concern, so flush has no benefit to you.
  14. https://forums.ni.com/t5/LabVIEW/Converting-Controls-to-Silver/td-p/1705536 https://forums.ni.com/t5/Quick-Drop-Enthusiasts/Quick-Drop-Keyboard-Shortcut-Silver-Conversion-Tool/gpm-p/3510319 as a general statement, I'd strongly recommend against doing this on all your code. UIs, ok, if you really like silver controls then by all means, but theres no point to changing subVIs and...its irritating. also, there are more attractive packages out there for UI. A reasonable but by no means complete starting point is here: https://forums.ni.com/t5/UI-Interest-Group-Discussions/bd-p/7116 For example drjdp's flatline controls (which is currently post number 2 in that link) are nice.
  15. Yeah, this is what I would do too. I'm assuming the goal is to make sure that if the program aborts the file isn't corrupt, but you can do that with flush file. If you're taking data every second the continuous open/seek/write/close/open... is going to take a toll. Whats the exact error you get? The modal out of memory error popup dialog, or a code? How big is the file at the time of the crash? Bigger than 2 GB? Are you using 32-bit labview on a 32-bit machine? Bigger than 4 GB? Are you using 32-bit labview on a 64-bit machine? Etc, etc. In theory file open shouldn't need to read the whole file into memory, but 🤷‍♂️ Easiest way to isolate this, though is to generate some representative chunk of fake data and write to a file in a loop relatively quickly (think every 150 ms rather than every second). If its the file code thats the problem, you should see the error within an hour. I would just say its kind of bad form to sequence things like that, as its much harder to read ( as this thread shows) and much easier to make a mistake (for example if you didn't have that clear error in there, or if you added another case but didn't wire the path through [and on that topic, linked tunnels are your friend]). Since we're talking about style, I'd personally do this: Take most of the bulk of case i=1 and make a subVI called "create file name" and a subVI called "create log header" I definitely would not build the path manually as you are doing with the concatenate string function -- I'd use the build path VI I'd wrap the folder check and the create file function into a reusable subVI -- I've never personally found a use for the default behavior where I ask the OS "make me a/file/in/a/folder.txt" and it responds "sorry bro that folder doesn't exist", so I always bundle the two together. The timestamp formatting section can be improved in one of two ways: Format date/time string using these format codes instead of manually bundling things (eg "Date_%Y_%m_%d_Time_%H_%M_%S_%3u") Use format into string with the same timestamp formatting code, except you have to put it inside of %<>T , ie "%<%Y_%m_%d_%H_%M_%S_%3u>T". The advantage to this is you can use the exact same format string to scan it back out again. If you do these three things, your create file case becomes just a few nodes and only takes up a small amount of space on the diagram...plus, you now have a "create file" function which you can reuse on future projects, and with some tweaking you have a "create standard file name" function you can use in the future as well. Excel may be smart enough to handle this, but you should probably set the extension so CSV, TSV, or TXT -- xlsx is in fact a zip file with a specific format, so writing regular ascii text to it will should not work. If you want to make a proper xlsx file (eg an excel file) you can use either the report generation toolkit (kind of slow, uses activex to connect to an excel instance so excel has to be installed on your daq computer) or an addon toolkit like xlr8: http://sine.ni.com/nips/cds/view/p/lang/en/nid/212056 If you have lv2018 and are at least familiar with python, you can use the python node + a small helper method to write to an excel file using xlsxwriter or openpyxl .
  16. I was under the impression that the .net interfaces just wrapped the old activex interfaces. Is that wrong? to actually answer your question I've never used it, but it seems like these might work: text ("TextType" section halfway down): https://docs.microsoft.com/en-us/visualstudio/vsto/how-to-programmatically-insert-text-into-word-documents?view=vs-2017 table: https://docs.microsoft.com/en-us/visualstudio/vsto/how-to-programmatically-create-word-tables?view=vs-2017 If I'm reading the samples right it looks like you can get the current cursor from "Application.Selection" and then insert a table using a method on that object.
  17. as I recall Martijn had some issues with the combo of VIPM mass compiling + *s in the CLFN path. I filed a CAR for him at the time but I doubt its resolved, and his workaround was (again, as far as I remember) that when you install the package it runs a script which adjusts the path based on the platform. The middle ground is what I think most people end up doing, which is to create a VI with some conditional disable code to determine the path. As I was reading this I remembered something else..far, far too late ...NI provides a zeromq build as part of the core package list. Package: zeromq Version: 4.1.6-r0.16 Depends: libc6 (>= 2.24), libgcc1 (>= 6.3.0), libsodium18 (>= 1.0.11), libstdc++6 (>= 6.3.0) Section: base Architecture: cortexa9-vfpv3 Maintainer: NI Linux Real-Time Maintainers <nilrt@ni.com> MD5Sum: ea3774e76c28b7c5b07318b4502fec9e Size: 147468 Filename: zeromq_4.1.6-r0.16_cortexa9-vfpv3.ipk Source: zeromq_4.1.6.bb Description: zeromq version 4.1.6-r0 ZeroMQ looks like an embeddable networking library but acts like a concurrency framework OE: zeromq HomePage: http://www.zeromq.org License: LGPLv3+ Priority: optional Package: zeromq-staticdev Version: 4.1.6-r0.16 Depends: zeromq-dev (= 4.1.6-r0.16) Section: devel Architecture: cortexa9-vfpv3 Maintainer: NI Linux Real-Time Maintainers <nilrt@ni.com> MD5Sum: 686b2b13e3908313aa35da8b46955ddc Size: 3765648 Filename: zeromq-staticdev_4.1.6-r0.16_cortexa9-vfpv3.ipk Source: zeromq_4.1.6.bb Description: zeromq version 4.1.6-r0 - Development files (Static Libraries) ZeroMQ looks like an embeddable networking library but acts like a concurrency framework This package contains static libraries for software development. OE: zeromq HomePage: http://www.zeromq.org License: LGPLv3+ Priority: optional All you should have to do is opkg update, opkg install zeromq, and opkg install zeromq-staticdev. Its available at least as far back as 2017. Note: you will still need to compile the wrapper library
  18. Thats kind of a circular question -- if the manufacturer doesn't want people to use their driver standalone, then they will not provide a header. If they want people to be able to use their driver standalone, they must provide a header. As I recall, lib files are only for statically linking within your application, which means you'd have to be writing in c or c++. LabVIEW and most everything else can only call dlls. If you only have a lib and not a dll, you'd have to write a little wrapper library and use a C compiler to build the wrapper+lib into a dll.
  19. The docs are a bit old, but it would be worth reading these: https://forums.ni.com/t5/Developer-Center-Resources/Tutorial-Configuring-the-Call-Library-Function-Node-to-call-a/ta-p/3522246 https://forums.ni.com/t5/Developer-Center-Resources/Calling-C-C-DLLs-from-LabVIEW/ta-p/3522488 Just skimming your PDF, a lot of this this looks like a reasonably straightforward dll to call from LabVIEW, but you have to get conceptually used to the interface. For example many of the functions have an opaque pointer like "CIFXHANDLE" which is represented in labview as a U64, but in order to get that pointer in the first place (xDriverOpen) you have to pass in a "0" value by reference, and the dll will overwrite that and provide you with the actual pointer on the output side of the CLFN. There are also a good number of things that are impossible in LabVIEW, namely callbacks: int32_t xSysdeviceDownload( CIFXHANDLE hSysdevice, uint32_t ulChannel uint32_t ulMode, char* pszFileName, uint8_t* pabFileData, uint32_t ulFileSize, PFN_PROGRESS_CALLBACK pfnCallback, PFN_RECV_PKT_CALLBACK pfnRecvPktCallback, void* pvUser) If you need those callbacks (they are optional), you can't create them natively from LabVIEW. You will have to make your own simple wrapper library which implements the callback functions. Given that there are about 80 pages of function descriptions, you might want to take the time to copy out all the calls you think you are going to need to use, and then review those calls for callbacks or other potential issues (the other big one that comes to mind is if functions lack a clear termination mechanism -- ie a "read" function that has no timeout or other way to cancel the read)
  20. Yeah its not super high in the grand scheme, but $2k for an addon to a product thats already $3k or $5k (not clear if you need the app builder license for building web apps?) seems pretty steep. Probably more to the point, it doesn't seem to be bundled with anything (not even software platform bundle). They seem to be deliberately targeting only people who really for sure want that functionality, which is kind of interesting within the context of NXG as a whole which they are literally giving away to try to get people interested in using it.
  21. 😢 Sometimes I just remove an entire splitter section and start over Theres a checkbox One of the first things I do on a new labview install, along with disabling the tiling shortcut, setting terminals to required, and removing that stupid number from new VI icons Ughhh. I hate the silver controls. Too much chrome. I generally use a combination of drjdp's flatline along with system and a collection of internal controls which includes a giant amount of scripted booleans using feather and iconic. To your second point -- I knew it was old based on the version number but I couldn't find a standalone screenshot of similar quality anywhere so I decided to punish them. Presumably thats why wikipedia still uses such an old screenshot. For what its worth I also include your example in this because the part thats attractive about it is really just PNGs. It doesn't demonstrate the core widget library that most people would use. And if you look at the designer, its seems like some stuff (type and ID in the middle of the right side for example) is just a hasty skin over top of an old library -- or at least thats how I interpret it because the weird left-side justification is the sort of artifact you get when you try to fiddle with labview controls in a similar way. On the theme of punishing them, I like this one, technically part of the help for the current major version (qt5).
  22. what you said worked The probe window is indeed annoying, I just have never thought about making indicators since then you have to restart the application and that can get quite annoying esp on rt. Its kind of funny I never thought about it because thats the workflow you have to use on fpga, but 🤷‍♂️ I think people conflate style and functionality on this topic. The style of labview controls is kind of old, but not any worse than wxwidgets or gtk+ or qt or windows forms. The stuff that makes labview stand out to me is resizing failures (lol @ trying to get splitters positioned nicely), composability failures (lol...xctrls), and the inability to instantiate new controls at runtime (now resolved in nxg). For contrast, its not like these (wx or gtk or this stark example of modernity) are all that more attractive, they just have features that allow for their developers to create better functionality. My favorite example is I think audacity which looks like complete garbage, but would be very difficult to develop in labview for..well look at it.
  23. Nope: And I can confirm both windows update correctly -- when I made the control it popped up in the panel side immediately. The reason I say its clunky is that you have to open the VI, pop it out of the main window, open the VI again, pop it out, and then switch. They need to streamline this, but the functionality is definitely there.
  24. Really? I've always hated the multiple windows. The MDI is one of my favorite things. The inconsistency makes me laugh, though, like making context help floating (there is only one -- I'd really rather it be docked and always on) and making palettes docked (I want several instances, so floating makes sense or at least allocating space on each side of the diagram so you can have one thats pinned and one thats not). I'm genuinely curious about this one...why both? My only experience with having FP and BD side by side is when I accidentally hit the stupid tiling hotkey on a new install, just before I go into the settings and permanently remap it to something out of the way like ctrl+alt+shift+\. I honestly can't think of a time I've ever done this. NXG has this too. Admittedly last I checked it was slow and clunky, but...
×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.